Charles s



Nrrnn STATES CHARLES S. DOLLEY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO HOIVARD T. GOODIVIN, OF SAME PLACE.

ELECTRODE FOR ARC-LIG HTS.

SPECIFICATION forming part of Letters Patent No. 606,127, dated June 21, 1898.

Application filed November 21, 1896.

To all whom it may concern:

Be it known that I, CHARLES S. DOLLEY, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Electrodes; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to certain new and useful improvements in electrodes especially designed for use in connection with electricarc lamps.

The object of the invention is the provision of a simple and inexpensive electric-arc electrode possessing longer life than the carbon electrodes which have heretofore been used, thus lessening materially the labor and expense attendant upon renewals.

The invention has for a further object the provision of an electric arc electrode by means of which a higher degree of illumination may be obtained with a given amount of current as compared with other electrodes now in use under the same conditions.

Owing to the composition used being of a highly-refractory nature and possessing also the requisite amount of resistance in itself it allows of a much longer are being produced and steadily maintained than in other arc-light electrodes, the angle of illumination being greatly increased, thus diffusing the light over a greater area.

In carrying out my invention I make the electrodes of calcium carbid, (CaO this material being cast or given its form by any other suitable or well-known method adapted to the purpose.

It is at once evident that my electric-arc electrode may be made of the usual shape Serial No. 612,992. (No specimens.)

I furthermore do not desire in this application to limit myself to electrodes made of calcium carbid(OaO for use in connection with electric-arc lamps solely, as it is my purpose to employ the same in connection with furnacewvork, in which, owing to the fact that the material is of ahighly-refractory nature, my electrodes are of special value, and therefore the present invention contemplates, broadly, the use of calcium carbid (OaC in the manufacture of electric-arc electrodes generally, regardless of the special use for which they may be found to be adapted.

What I claim to be new, and desire to secure by Letters Patent, is-- 1. An electric-arc electrode manufactured of calcium carbid (OaO substantially as described.

2. An electric-arc electrode manufactured of calcium carbid (OaO ofsize, shape and resistance proportional to the amount of current used, substantially as described and for the purpose specified.

8. An electric-arc electrode for use in connection with electric-arc lamps, the same consisting of calcium carbid, (Ca,O of size, shape and resistance proportionate to the amount of current used, substantially as described and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES S. DOLLEY.

Witnesses:

CHAS. H. BANNARD, WM; E. STOKES. 

